A:Answer it won't be easy. I have a box of 100 12V adapters and not 1 of them fits. a Netgear 12V router adapter is a very common plug size, and that was too big. the jack says 12V 3A, which should require a bigger plug, but this one is smaller, which is odd. I don't think you're going to find one. nothing uses a smaller plug with higher amps.
what did fit, were 5V adapters. you could transplant a plug like that onto a 12V 3A adapter. or a 2.5A would probably work.